Skyrim Map loading screen

The mapload screen, features markers not on the physical map that comes with some of the legendary edition.
Does anyone know what they mark?
As always keep it light and have fun discussing what they could be.

Well, the loading screen that is just a map of Skyrim (there is one that's a map on a table: ignore that one) has markers that are squares and circles. I have a map of Skyrim as part of the special edition and those markers are the standing stones. However the loading screen map markers aren't in the same place.
I'm sure someone has investigated, Skyrim is 9 years old.